s'={((t+(Subscript[T, drive])(t,h,h'),h',n'),with   probability   q,(t,h,n),with   probability   1-q,)
r={((f(t,h,h'),with   probability   (Subscript[P, od])(h'|t,h,n),0,with   probability   1-(Subscript[P, od])(h'|t,h,n),)